MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/S3Asm.nasm

   1 ;; @file
   2 ;   This is the assembly code for transferring to control to OS S3 waking vector
   3 ;   for IA32 platform
   4 ;
   5 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   6 ;
   7 ; This program and the accompanying materials
   8 ; are licensed and made available under the terms and conditions of the BSD License
   9 ; which accompanies this distribution.  The full text of the license may be found at
  10 ; http://opensource.org/licenses/bsd-license.php
  11 ;
  12 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 ;
  15 ;;
  16     SECTION .text
  17
  18 global ASM_PFX(AsmFixAddress16)
  19 global ASM_PFX(AsmJmpAddr32)
  20
  21 ;-----------------------------------------
  22 ;VOID
  23 ;AsmTransferControl (
  24 ;  IN   UINT32           S3WakingVector,
  25 ;  IN   UINT32           AcpiLowMemoryBase
  26 ;  );
  27 ;-----------------------------------------
  28
  29 global ASM_PFX(AsmTransferControl)
  30 ASM_PFX(AsmTransferControl):
  31     ; S3WakingVector    :DWORD
  32     ; AcpiLowMemoryBase :DWORD
  33     push  ebp
  34     mov   ebp, esp
  35     lea   eax, [.0]
  36     push  0x28               ; CS
  37     push  eax
  38     mov   ecx, [ebp + 8]
  39     shrd  ebx, ecx, 20
  40     and   ecx, 0xf
  41     mov   bx, cx
  42     mov   [@jmp_addr], ebx
  43     retf
  44 .0:
  45     DB    0xb8, 0x30, 0      ; mov ax, 30h as selector
  46     mov   ds, ax
  47     mov   es, ax
  48     mov   fs, ax
  49     mov   gs, ax
  50     mov   ss, ax
  51     mov   eax, cr0          ; Get control register 0
  52     DB    0x66
  53     DB    0x83, 0xe0, 0xfe   ; and    eax, 0fffffffeh  ; Clear PE bit (bit #0)
  54     DB    0xf, 0x22, 0xc0    ; mov    cr0, eax         ; Activate real mode
  55     DB    0xea              ; jmp far @jmp_addr
  56 @jmp_addr: DD 0
  57
  58 global ASM_PFX(AsmTransferControl32)
  59 ASM_PFX(AsmTransferControl32):
  60   jmp ASM_PFX(AsmTransferControl)
  61
  62 ; dummy
  63 global ASM_PFX(AsmTransferControl16)
  64 ASM_PFX(AsmTransferControl16):
  65 ASM_PFX(AsmFixAddress16): DD 0
  66 ASM_PFX(AsmJmpAddr32): DD 0
  67